Swift: 如何获取动态UITableView 中自定义单元格中滑块的值?
Swift: How to get the value of a slider in a custom cell in a dynamic UITableView?
我遇到以下情况的问题:
我有一个带有动态单元格的 UITableView
。其中,我使用自定义 UITableViewCell
和 UISlider
。如何获取滑块的值?
我创建了以下示例:(项目文件可以在这里下载:Link)
SliderClass.swift
import UIKit
class SliderClass: NSObject {
var title: String
var subtitle: String
var sliderMinimum: Float
var sliderMaximum: Float
init(title: String, subtitle: String, sliderMinimum: Float, sliderMaximum: Float) {
self.title = title
self.subtitle = subtitle
self.sliderMinimum = sliderMinimum
self.sliderMaximum = sliderMaximum
}
}
SliderTableViewCell.swift
import UIKit
class SliderTableViewCell: UITableViewCell {
@IBOutlet weak var cellTextLabel: UILabel!
@IBOutlet weak var cellDetailTextLabel: UILabel!
@IBOutlet weak var cellSlider: UISlider!
override func awakeFromNib() {
super.awakeFromNib()
}
override func setSelected(selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
}
}
TableViewController.swift
import UIKit
class TableViewController: UITableViewController {
var slider: [SliderClass] = []
override func viewDidLoad() {
super.viewDidLoad()
title = "Slider"
let slider1 = SliderClass(title: "Title1", subtitle: "Subtitle1", sliderMinimum: 0, sliderMaximum: 100)
let slider2 = SliderClass(title: "Title2", subtitle: "Subtitle2", sliderMinimum: 0, sliderMaximum: 200)
slider = [slider1, slider2]
}
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return slider.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("sliderCell", forIndexPath: indexPath) as! SliderTableViewCell
let slider: SliderClass
slider = self.slider[indexPath.row]
cell.cellTextLabel.text = slider.title
cell.cellDetailTextLabel?.text = slider.subtitle
cell.cellSlider.minimumValue = slider.sliderMinimum
cell.cellSlider.maximumValue = slider.sliderMaximum
return cell
}
func sliderValueChange() {
// I need help here:
// Which slider changed to which value?
// var slider = ...
// var sliderValue = ...
// NSLog("Value of slider:%@ changed to:%i", slider, sliderValue)
}
}
这是使用上述代码创建的 UITableView 的屏幕截图。
尝试将此添加到您的 cellForRowAtIndexPath
函数中:
cell.cellSlider.tag = indexPath.row
cell.cellSlider.addTarget(self, action: "sliderValueChange:", forControlEvents: .ValueChanged)
然后在 table 函数之外添加如下内容:
func sliderValueChange(sender: UISlider) {
// Get the sliders value
var currentValue = Int(sender.value)
var sliderRow = sender.tag
// Do whatever you want with the value :)
// And now the row of the slider!
}
确保 cellSlider
目标的动作名称与函数名称相同!由于它需要一个参数,所以不要忘记末尾的冒号。
总结一下,这是一个非常简单的上述操作示例:
import UIKit
class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 2 // 2 rows in the cell, for demo purposes
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as! TableViewCell
cell.slider.tag = indexPath.row
cell.slider.addTarget(self, action: "sliderChange:", forControlEvents: .ValueChanged)
return UITableViewCell()
}
func sliderChange(sender: UISlider) {
let currentValue = sender.value // get slider's value
let row = sender.tag // get slider's row in table
print("Slider in row \(row) has a value of \(currentValue)")
// example output - Slider in row 1 has a value of 0.601399
}
}
class TableViewCell: UITableViewCell {
@IBOutlet var slider: UISlider!
}
获取自定义单元格中滑块的值。
希望这对您有所帮助,请仔细阅读 Swift 中的 GitHub 代码并参考屏幕截图
https://github.com/appcoda/expandable-table-view
另一种选择是使用 ASValueTrackingSlider。注意是写在ObjectiveC
.
我遇到以下情况的问题:
我有一个带有动态单元格的 UITableView
。其中,我使用自定义 UITableViewCell
和 UISlider
。如何获取滑块的值?
我创建了以下示例:(项目文件可以在这里下载:Link)
SliderClass.swift
import UIKit
class SliderClass: NSObject {
var title: String
var subtitle: String
var sliderMinimum: Float
var sliderMaximum: Float
init(title: String, subtitle: String, sliderMinimum: Float, sliderMaximum: Float) {
self.title = title
self.subtitle = subtitle
self.sliderMinimum = sliderMinimum
self.sliderMaximum = sliderMaximum
}
}
SliderTableViewCell.swift
import UIKit
class SliderTableViewCell: UITableViewCell {
@IBOutlet weak var cellTextLabel: UILabel!
@IBOutlet weak var cellDetailTextLabel: UILabel!
@IBOutlet weak var cellSlider: UISlider!
override func awakeFromNib() {
super.awakeFromNib()
}
override func setSelected(selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
}
}
TableViewController.swift
import UIKit
class TableViewController: UITableViewController {
var slider: [SliderClass] = []
override func viewDidLoad() {
super.viewDidLoad()
title = "Slider"
let slider1 = SliderClass(title: "Title1", subtitle: "Subtitle1", sliderMinimum: 0, sliderMaximum: 100)
let slider2 = SliderClass(title: "Title2", subtitle: "Subtitle2", sliderMinimum: 0, sliderMaximum: 200)
slider = [slider1, slider2]
}
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return slider.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("sliderCell", forIndexPath: indexPath) as! SliderTableViewCell
let slider: SliderClass
slider = self.slider[indexPath.row]
cell.cellTextLabel.text = slider.title
cell.cellDetailTextLabel?.text = slider.subtitle
cell.cellSlider.minimumValue = slider.sliderMinimum
cell.cellSlider.maximumValue = slider.sliderMaximum
return cell
}
func sliderValueChange() {
// I need help here:
// Which slider changed to which value?
// var slider = ...
// var sliderValue = ...
// NSLog("Value of slider:%@ changed to:%i", slider, sliderValue)
}
}
这是使用上述代码创建的 UITableView 的屏幕截图。
尝试将此添加到您的 cellForRowAtIndexPath
函数中:
cell.cellSlider.tag = indexPath.row
cell.cellSlider.addTarget(self, action: "sliderValueChange:", forControlEvents: .ValueChanged)
然后在 table 函数之外添加如下内容:
func sliderValueChange(sender: UISlider) {
// Get the sliders value
var currentValue = Int(sender.value)
var sliderRow = sender.tag
// Do whatever you want with the value :)
// And now the row of the slider!
}
确保 cellSlider
目标的动作名称与函数名称相同!由于它需要一个参数,所以不要忘记末尾的冒号。
总结一下,这是一个非常简单的上述操作示例:
import UIKit
class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 2 // 2 rows in the cell, for demo purposes
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as! TableViewCell
cell.slider.tag = indexPath.row
cell.slider.addTarget(self, action: "sliderChange:", forControlEvents: .ValueChanged)
return UITableViewCell()
}
func sliderChange(sender: UISlider) {
let currentValue = sender.value // get slider's value
let row = sender.tag // get slider's row in table
print("Slider in row \(row) has a value of \(currentValue)")
// example output - Slider in row 1 has a value of 0.601399
}
}
class TableViewCell: UITableViewCell {
@IBOutlet var slider: UISlider!
}
获取自定义单元格中滑块的值。
希望这对您有所帮助,请仔细阅读 Swift 中的 GitHub 代码并参考屏幕截图
https://github.com/appcoda/expandable-table-view
另一种选择是使用 ASValueTrackingSlider。注意是写在ObjectiveC
.